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An ecological risk assessment model for a pulsed contaminant emission into a wetland channel flow

Author

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  • Chen, G.Q.
  • Zeng, L.
  • Wu, Z.

Abstract

As a continuation of the modelling on ecological degradation and hydraulic dispersion of pollutant emission into an idealized two-dimensional free-surface wetland flow (Zeng, L., Chen, G.Q., 2009b. Ecological degradation and hydraulic dispersion of contaminant in wetland. Ecol. Model., doi:10.1016/j.ecolmodel.2009.10.024), an ecological risk assessment model for the typical case of a pulsed contaminant emission into a realistic three-dimensional wetland channel flow is presented in this paper for the fate of cross-sectional mean concentration under environmental dispersion. An environmental dispersion model for the mean concentration is devised as an extension of Taylor’s classical analysis on dispersion in fluid flows. The velocity distribution and the environmental dispersivity in the fully developed steady flow through the wetland is found and illustrated with limiting cases covering various known solutions for the porous media flow between parallel plates, flow in a shallow wetland, sweeping flow in a densely vegetated wetland, and single phase flow in a channel. Obtained by Aris’s method of moments, the environmental dispersivity is shown characterized with multi-scale asymptotic time variations with stem dominated stage, transitional stage, and width–depth-stem dominated stage. Based on the solution for the evolution of contaminant cloud in the wetland channel flow, critical length and duration of the contaminant cloud with concentration beyond given environmental standard level are concretely illustrated for typical pollutant constituents in wastewater emission. Under the same emission intensity and environmental standard, the duration of contaminant cloud in the wetland channel is revealed shorter than that in a free surface wetland, due to the lateral effect.

Suggested Citation

  • Chen, G.Q. & Zeng, L. & Wu, Z., 2010. "An ecological risk assessment model for a pulsed contaminant emission into a wetland channel flow," Ecological Modelling, Elsevier, vol. 221(24), pages 2927-2937.
    • Handle: RePEc:eee:ecomod:v:221:y:2010:i:24:p:2927-2937
    DOI: 10.1016/j.ecolmodel.2010.08.018
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    Citations

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    Cited by:

    1. Yang, Zhifeng & Mao, Xufeng, 2011. "Wetland system network analysis for environmental flow allocations in the Baiyangdian Basin, China," Ecological Modelling, Elsevier, vol. 222(20), pages 3785-3794.
    2. Wu, X.F. & Chen, G.Q. & Wu, X.D. & Yang, Q. & Alsaedi, A. & Hayat, T. & Ahmad, B., 2015. "Renewability and sustainability of biogas system: Cosmic exergy based assessment for a case in China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 51(C), pages 1509-1524.
    3. Tang, P.Z. & Liu, J.Z. & Lu, H.W. & Wang, Z. & He, L., 2017. "Information-based Network Environ Analysis for Ecological Risk Assessment of heavy metals in soils," Ecological Modelling, Elsevier, vol. 344(C), pages 17-28.
    4. Zeng, L. & Wu, Y.H. & Ji, P. & Chen, B. & Zhao, Y.J. & Chen, G.Q. & Wu, Z., 2012. "Effect of wind on contaminant dispersion in a wetland flow dominated by free-surface effect," Ecological Modelling, Elsevier, vol. 237, pages 101-108.
    5. Wu, Z. & Chen, G.Q. & Zeng, L., 2011. "Environmental dispersion in a two-zone wetland," Ecological Modelling, Elsevier, vol. 222(3), pages 456-474.
    6. Chen, Shaoqing & Chen, Bin & Fath, Brian D., 2013. "Ecological risk assessment on the system scale: A review of state-of-the-art models and future perspectives," Ecological Modelling, Elsevier, vol. 250(C), pages 25-33.
    7. Mandal, Sudipto & Roy Goswami, Abhishek & Mukhopadhyay, Subhra Kumar & Ray, Santanu, 2015. "Simulation model of phosphorus dynamics of an eutrophic impoundment – East Calcutta Wetlands, a Ramsar site in India," Ecological Modelling, Elsevier, vol. 306(C), pages 226-239.

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